As someone who did BLU/WAR tanking and BLU/WHM healing I can say that job is ridiculously powerful. Seriha is right, at release BLU didn't have much in the way of healing spells outside H.breeze and M.fruit at "higher" levels. This pretty much made BLU's into "just another" melee DD. Once SE added W.Carrot it made BLU as a main healer possible as BLU's lacked a cheap heal at lower levels. M.Fruit scaling as a Cure V but only 72mp is ridiculous, outside of curaga it's the most efficient heal in the game. H.Breeze was amazing, 55MP for the healing power of a 120MP spell. It was so good that I would go RDM/BLU at 75 to merit on birds (this was before SCH was made). Now they have aoe erase, Curaga IV, Cure 4.5, Cure 4.8, Auto-Refresh, Self-Haste, Self-Refresh, Lullaby, Sleepga, Sleepga II, and whatever they get from their sub.

BLU is now the 2nd best healer in the game, and people still want tell a RDM it's their job to "shut up and heal".